How do I get a copy of the Oil/Gas lease agreement?
Welcome to the forum. The answer depends a bit on how old the lease is and what you know about it. If it is since about 1991 or so and you know who signed it, you can find it at www.okcountyrecords.com. You can view for free or pay a few dollars to print it. If you know who the operator is, then you can contact them and get it.
https://okcountyrecords.com/search/dewey
Probably this record: https://okcountyrecords.com/detail/dewey/2018-002041/20863245
I hope you were paid your lease bonus.